Embedded Extended Visual Cryptography Schemes

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Embedded Extended Visual Cryptography Schemes

• By
• SHAIK TABREZ(09J01A1225)
• ISMAIL IMANI(09J01A1232)
• MOHD AHMED(O9J01A1221)

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INTRODUCTION

• THE basic principle of the visual cryptography
  scheme (VCS) was first introduced by Naor and
  Shamir. VCS is a kind of secret sharing scheme
  that focuses on sharing secret images.

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The idea of the visual cryptography model
proposed in is to split a secret image into two
random shares (printed on transparencies) which
separately reveals no information about the
secret image other than the size of the secret
image.
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The size of all the images is 768768
The size of all the images is 768 768.
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BRIEF OVERVIEW OF DOMAIN

• (Information Security)

• The quality or state of being secure to be free
  from danger

• Security is achieved using several strategies63

• Security is achieved using several strategies
  simultaneously or used in combination with one
  another

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• Security is recognized as essential to protect
  vital processes and the systems that provide
  those processes
• Security is not something you buy, it is
  something you do

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PREVIOUS WORK

• Visual cryptography is the art and science of
  encrypting the image in such a way that no-one
  apart from the sender and intended recipient even
  realizes the original image, a form of security
  through obscurity. By contrast, cryptography
  obscures the original image, but it does not
  conceal the fact that it is not the actual image.

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LIMITATIONS

• The existing system does not provide a friendly
  environment to encrypt or decrypt the data
  (images).

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• PROPOSED SYSTEM
• Visual cryptography provides a friendly
  environment to deal with images. Generally
  cryptography tools supports only one kind of
  image formats. Our application supports .gif and
  .png (portable network graphics) formatted images
  and our application has been developed using
  swing and applet technologies, hence provides a
  friendly environment to users.

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 ADVANTAGES OF PROPOSED SYSTEM

• EVCS is flexible in the sense that there exist
  two trade-offs between the share pixel expansion
  and the visual quality of the shares and between
  the secret image pixel expansion and the visual
  quality of the shares.
• This flexibility allows the dealer to choose the
  proper parameters for different applications.

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MODULE S

• This application consist FOUR modules
• VISUAL CRYPTOGRAPHY IMPLEMENTATION
• ENCODING
• DECODING
• TESTING AND INTEGRATION

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1. VISUAL CRYPTOGRAPHY IMPLEMENTATION

• This module is the core for the project, where we
  implement the Visual Cryptography. We used LZW
  Data Compression algorithm. The LZW data
  compression algorithm is applied for the gray
  scale image here.

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2.ENCODING

• The algorithm works by scanning through the input
  string for successively longer substrings until
  it finds one that is not in the dictionary

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3.DECODING

• The decoding algorithm works by reading a value
  from the encoded input and outputting the
  corresponding string from the initialized
  dictionary
• the final input value is decoded without any more
  additions to the dictionary

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4.TESTING AND INTEGRATION

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• This is the final module, which consists of
  integration of Visual cryptography implementation
  module into interface design using applet viewer.
  

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SYSTEM ARCHITECTURE
SELECT IMAGE
SELECT NON TRANSPRANCIE

• SENDER

ENCRYPT
SAVE TRANSPRANCIES
RECIEVER
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HARDWARE AND SOFTWARE REQUIREMENTS

• HARDWARE REQUIREMENTS
• System Pentium IV 2.4 GHz.
• Hard Disk 40 GB.
• Floppy Drive 1.44 Mb
• Ram 512 Mb.

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SOFTWARE REQUIREMENTS

• Operating system Windows XP
• Coding Language JDK 1.6
• Tools Netbeans

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CONCLUSION

• we proposed a construction of EVCS which was
  realized by embedding the random shares into the
  meaningful covering shares.
• The shares of the proposed scheme are meaningful
  images, and the stacking of a qualified subset of
  shares will recover the secret image visually.
• the visual quality of the shares and between the
  secret image pixel expansion and the visual
  quality of the shares.

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• Thank you!!!!!!